Warning: Undefined variable $conn in /home2/satbir4/learnphp.bestcomputercentre.com/php-Email/sending-email-with-mysql-database.php on line 13

Fatal error: Uncaught Error: Call to a member function query() on null in /home2/satbir4/learnphp.bestcomputercentre.com/php-Email/sending-email-with-mysql-database.php:13 Stack trace: #0 {main} thrown in /home2/satbir4/learnphp.bestcomputercentre.com/php-Email/sending-email-with-mysql-database.php on line 13